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For VOCs, only those VOCs that exhibited detections for the third quarter 2007 monitoring event were plotted. Historical data from the corrective action monitoring wells from March 1994 to the present were analyzed for temporal trend using Sen's Slope trend analysis. Graphs of the Sen's Slope analyses for corrective action monitoring wells are included in Appendix G. Table 2.4 summarizes the results of the corrective action monitoring well trend analysis. The following inorganic constituents exhibited an increasing trend according to the Sen's Slope analysis:barium at AMW- 1, AMW-5R, and AMW-18, bicarbonate at AMW-1, AMW-5R, and AMW-18, chloride at AMW-5R,nitrate at AMW-5R, field pH at AMW-5R and AMW-11, field specific conductance at AMW-1 and AMW-5R, sulfate at AMW-5R and AMW-10, total dissolved solids at AMR-5R, and field turbidity at AMW-19. The third quarter 2007 concentration of barium at AMW-1 (0.4 mg/L) is comparable to concentrations observed at that well intermittently since May 2004, and is well below the National Primary Drinking Water Standard (2 mg/L). The third quarter 2007 concentration of barium at AMW-5R (0.48 mg/L) is greater than concentrations previously observed at AMW-5. The third quarter 2007 concentration of barium at AMW-18 (0.17) is comparable to concentrations observed at that well intermittently since August 2005, and is well below the National Primary Drinking Water Standard(2 mg/L). The third quarter 2007 concentration of bicarbonate at AMW-1 (870 mg/L) is comparable to concentrations observed at that well intermittently since August 2003. The third quarter 2007 concentration of bicarbonate at AMW-5R (550 mg/L) is greater than concentrations previously observed at AMW-5. The third quarter 2007 concentration of bicarbonate at AMW-18 (330 mg/L) is comparable to concentrations observed at that well consistently since November 2004. The third quarter 2007 concentration of chloride at AMW-5R (130 mg/L) is greater than concentrations previously observed at AMW-5, but is below the National Secondary Drinking Water Standard (250 mg/L). The third quarter 2007 concentration of nitrate at AMW-5R (31 mg/L)is greater than concentrations previously observed at AMW-5. The field pH value observed at AMW-5R during the third quarter 2007 (7.38 s.u.) is comparable to pH values observed at AMR-5 intermittently since April 1999, and is within the National Secondary Drinking Water Standard range(6.5 - 8.5 s.u.). The field pH value observed at AMW- 11 during the third quarter 2007(7.39 s.u.)is comparable to pH valued observed at that well since consistently since May 2004, and is within the National Secondary Drinking Water Standard range (6.5 - 8.5 s.u.). The third quarter 2007 field specific conductance value at AMW-1 (1,330 umhos/cm) is comparable to values observed at that well consistently since August 2005. The third quarter 2007 field specific conductance value at AMW-5R(1,400 umhos/cm) is comparable to values observed at that well intermittently since November 2003. The third quarter 2007 concentration of sulfate at AMW-5R (65 mg/L) is comparable to concentrations observed at AMW-5 consistently since July 2001, and is well below the National Secondary Drinking Water Standard(250 mg/L). The third quarter 2007 concentration of sulfate at AMW-10(70 mg/L)is comparable to concentrations observed at that well since May 2006,and is well below the National Secondary Drinking Water Standard (250 mg/L). The third quarter 2007 concentration of total dissolved solids at AMW-5R (830 mg/L) is greater than concentrations previously observed at AMW-5. The field turbidity value observed at AMW-19 during the third quarter 2007 (>999 NTUs) is consistent with the field turbidity observed at that ® well during the past three monitoring events. 4